![]() On the other hand, oil with a viscosity that is too low might improve efficiency or overall power output. Oil flow could be restricted somewhat to critical engine parts that require constant lubrication. Using an oil with a viscosity that is too high will cause the engine to work harder to pump it, resulting in higher heat and/or fuel consumption. Engine oils with different viscosity will have different flow rates that could impact engine health, and engine design plays a role in what oil viscosities are recommended. Why should I use the right viscosity in my vehicle?įirst and foremost, the primary goal of any manufacturer recommendation is to protect the engine and its critical components. The “40” as the second number is the oil viscosity using the viscosity improver to enhance the engine protection at operating temperature. This rating is critical for determining the oil flow when cold to properly protect an engine at start up. Using XPS 5W-40 as an example, the first number (5W) is the base oil viscosity – or the starting point of the oil before you start your engine. Understanding the ratings on the label is the key to making the right viscosity choice for your vehicle. You’ll find multiple viscosity ratings on the bottle: one for cold/cold-start conditions and one for operating conditions (once the engine is warmed up). ![]() Most oil recommendations for recreational vehicles, as well as marine engines and passenger cars are multi-grade formulas. How we should read or understand the “XW-XX?” Engine oil comes in a variety of viscosities, which are classified by specific test methods and temperatures. Using the proper viscosity engine oil is not only critical for prolonged engine life, but also maximizing performance and economy as well. Everything – from water to peanut butter – has a viscosity index. More accurately, viscosity is defined as the resistance to flow in terms of friction. Viscosity is often simply thought of as a liquid’s thickness or the rate at which it will flow.
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